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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36ff07cb72a5f4d0b697171d9e3e7e6d56c9722b2f1680f335ea5ea710f8147' 
  AND token = 'pfEN0hlyC4ldOa4PJ6lj7nqeK6CO87pVwRwLTzXsuyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}